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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels (Details) | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Line Items] |
Dry-dock requirement | 5 years
Vessels |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 35 years
Dry-docking |
Property, Plant and Equipment [Line Items] |
Estimated useful life | 5 years

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- Definition Vessel, Dry Dock Requirement, Period + References No definition available. + Details
Name: | flng_VesselDryDockRequirementPeriod
Namespace Prefix: | flng_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=flng_VesselsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=flng_DryDockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |